fix: handle backend issue list regressions

server/im_http_test.go

@@ -3166,6 +3166,18 @@ func TestServeIMSystemNotificationsListAndRead(t *testing.T) {
 	if readAgainData["id"] != "evt-2" || readAgainData["read_at"] != readAt.UTC().Format(time.RFC3339Nano) {
 		t.Fatalf("read again response should keep persisted read_at: %#v", readAgainData)
 	}
+
+	expectIMBearer(t, ctrl, "token-read-future", 7, 42)
+	req = httptest.NewRequest(http.MethodPost, "/v1/im/system-notifications/evt-1/read", bytes.NewBufferString(`{"read_at":"2099-01-01T00:00:00Z"}`))
+	req.Header.Set("Authorization", "Bearer token-read-future")
+	req.Header.Set("Idempotency-Key", "read-future")
+	rec = httptest.NewRecorder()
+
+	serveIMSystemNotificationRead(rec, req)
+
+	if rec.Code != http.StatusBadRequest {
+		t.Fatalf("future read_at status: got %d, want %d; body=%s", rec.Code, http.StatusBadRequest, rec.Body.String())
+	}
 }
 
 func TestServeIMMessageReceipts(t *testing.T) {